[sdiy] HF VCOs and tracking problems

[Oscar Salas]

>> I'm trying to design a high frequency VCO, something that can span a
>> frequency range of ~6-200kHz. I'm basing it off of a standard sawtooth
>> core and i'm experiencing tracking problems. I realized this might be an
>> issue before i begun but i don't really understand what the underlying
>> problem is, nor the remedy.


> So, if the biggest culprit is the uneven charge/discharge time would i be
> better off using a different type of VCO core? Like a triangle wave core
> for instance?



If you use a triangle core and have tracking problems at high frequencies,
you could operate the triangle core at more low frequencies and pass the
triangle wave through several "Absolute Value Circuit" in series
compensating offset and amplitude. Each of one will double the frequency.


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